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On Thursday, a Saudi-led coalition bombed the rebels in support of Yemen's embattled President Abedrabbo Mansour Hadi, pushing WTI to a one-month high of US$52.48 and Brent to a March 9 peak of US$59.78.

The coalition air strikes continued Friday as Hadi arrived in Egypt for talks with Arab allies.

"The crude complex is unwinding some of yesterday's geopolitically sponsored gains, as fears of contagion spreading in the Middle East calm," said Matt Smith of Schneider Electric.

Yemen is a small oil producer that sits along the Bab al-Mandab Strait, through which about 3.8 million barrels of oil per day are transported.

The country has been gripped by turmoil since the Shiite rebels launched a power takeover in Sanaa in February.